It's completely dependent on tires. Four-wheel drive isn't going to do anything for you if your tires can't grip anything. But yes, a 4x4 with with proper tires on it will be better in the snow.

I agree, but I make sure to have an AT tire on 4WD, not summer times. It is also the confidence that 4WD gives you. I avoid hills in this car, even with snows. If someone gets stuck, you're in trouble, pulling away at stop lights most times you're fish tailing and your wheels are spinning.
I also have to go to work no matter how bad the weather is, and late at night. I either have to shovel my driveway to get out, or wake the neighbors with the snow blower at 3am. Rant over. :-D